CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 56,007,937	$ 33,478,347	$ 150,095,975	$ 103,463,316
Cost of products sold	(44,058,406)	(24,105,604)	(113,888,301)	(77,980,077)
Gross margin	11,949,531	9,372,743	36,207,674	25,483,239
Engineering expenses	(1,848,861)	(663,705)	(4,162,151)	(1,991,260)
Selling and administrative expenses	(6,527,029)	(5,444,924)	(23,749,219)	(16,161,133)
Operating profit	3,573,641	3,264,114	8,296,304	7,330,846
Interest expense	(327,206)	(28,817)	(659,884)	(97,486)
Other income	13,513	28,169	69,278	54,687
Income before income taxes	3,259,948	3,263,466	7,705,698	7,288,047
Income taxes	1,029,467	863,402	2,491,674	2,152,073
Net income	$ 2,230,481	$ 2,400,064	$ 5,214,024	$ 5,135,974
Earnings per Share:
Basic (in dollars per share)	$ 0.36	$ 0.38	$ 0.83	$ 0.82
Diluted (in dollars per share)	0.35	0.38	0.83	0.82
Cash dividends per share: (in dollars per share)	$ 0.11	$ 0.11	$ 0.33	$ 0.33